package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    //微信服务接口地址
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;
    //微信登录
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信服务器接口获得当前微信用户的openId
        String openId = getOpenId(userLoginDTO.getCode());
        //判断是否拿到openId，为空则失败，抛出业务异常
        if (openId == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //不为空，判断是否为新用户
        User user = userMapper.getByOpenId(openId);
        //为新用户，创建用户信息，保存到数据库，并返回用户信息
        if(user == null){
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user);
        }
        return user;
    }

    //调用微信接口服务获得当前用户的唯一标识id
    private  String  getOpenId(String code){
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openId = jsonObject.getString("openid");
        return openId;
    }
}
